• Maxflo range of single, dual and triple media pressure filters.
• Moore rapid gravity sand filters for larger installations.
• Maxflo AC activated carbon filters.
• Microflo cartridge and bag filters.
• Flowking compact filters.
• Upflo range of up-flow media filters.
• AGF autonomous filters.
• Waterex ultra-, nano- and micro- filtration membrane filters. (Please see our RO page for more details on these units).
• Girosand continuous media filters.

• Minimum water consumption for backwash guaranteed less than 1 ½ percent of throughput.
• Media maintained in perfect condition by careful backwash and air scour design.
• No draining of filter during the backwash sequence.
• Excellent even air agitation on all filters reproduced for every backwash sequence.
• No backwash pumps required.
• Large wash-water valves eliminated and no external wash-water mains.
• Each filter stores its own wash-water.
• The necessity for external wash-water reservoirs, sumps etc. eliminated.
• A standby blower provides complete standby for both air agitation and backwashing.
• Backwashing activated by loss of head across the filter or timer standby.
• Simple structure with no complicated filter distribution floor.

The Waterex range of AGF gravity media filters offer the following features:

• Self cleaning requiring no power or operator attendance.
• No valves or instrumentation required for control.
• No valves or automation systems required for backwash sequence.
• The filter comprises three compartments in a vertical steel tank namely:
  • Storage zone.
  • Filtration zone.
  • Collection compartment.
• Autonomous filtration is achieved solely through the process of media filtration.
• Backwash actuated by the loss of head across the filter.
• Eliminates the need for backwash pumps and valves.
• Filters operate with a minimal head loss of 1.2-1.5m across the unit.
• Under the conditions set out above a surface backwash with or without air scour is not required to breakup the surface mat to achieve effective regeneration of the filter bed.
• In critical situations or where there is a concern about media binding, air scour options are supplied.
• Double-decker arrangements offered for confined space installations.
• Pilot plant unit available in Australia.
• Standard capacities range from 3-640 m3/hr/filter.

Waterex supplies bag and cartridge filters to meet the demands of cost effective and polishing installations. These filters augment the supply of our other filters and liquid treatment plants.

Bag filters offered typically include the following benefits:

• Capacities range from 0.5 to 35 m3/hr/bag filter.
• Filtration range from 1 to 800 micron.
• Suitable for operating pressures up to 10 bar as standard.
• Best used on installations where the solids loading is less than 250 mg/l.
• Multiple bags, up to three, used in single housings to reduce capital outlay whilst still producing multiple filtration.
• Shells in 304 or 316Lss supplied as standard.
• Suitable for viscosities up to 10 000 cps.
• Different bag materials available typically in felted or monofilament mesh.
• Suitable for liquors at up to 135 or 150 degrees C depending on bag type.
• Clamp seal, swan neck and swing bolt vessel seal arrangements provided.

• Casings for the smaller installation in polycarbonate.
• Shells for the large units in 304 or 316 passivated stainless steel.
• Capacities from 0.25 to 160 m3/hr/vessel.
• Standard micron ratings range from 100 down to 1 micron.
• Special submicron cartridges available in 0.4 & 0.2 micron sizes.
• Cartridges manufactured in blown fiber, spiral wound and pleated fabric.

The Waterex Girosand media filter simultaneously backwashes the media whilst filtering the feed water or liquor. The Girosand filter offers the following benefits:

• Standard sizes suitable for 4 - 75 m3/hr/filter.
• High filtration efficiency.
• External easy to service media lift system; no centrally positioned awkward design.
• Air lift diffuser readily isolated, cleaned or overhauled on line.
• Isolation air lift with media rinse well to ensure full backwash and rinse sequences.
• Manageable reject stream.
• Baffled return system to ensure no contamination from recycled media.
• Designs accept various media bed depths so providing optimum selection for the application.
• Minimum energy requirements.
• Pilot plant systems available .
• Deep cone WREX, or other suitable, thickener provided when recovery of the back wash liquor is critical.

The Waterex range of Maxflo media filters are offered with the following features, selection being made to suit the application.

• Ultra high rate filtration even for arduous applications.
• Single, dual and triple media filters supplied to meet client criteria.
• Filtration at several layers, using in depth techniques, provides high dirt holding capacities.
• Coarse to fine filtration provides improved filtration efficiency.
• Protected mild steel, most stainless steels and FRP shells available.
• Designs that provide 20 & 10 micron filtrates; options for 5 micron in specific situations.
• Differential pressure actuation with time clock standby.
• PLC control with lapse time interlocks to minimise 'media bumping'.
• PLC systems offered with interlocks for multiple filters, pump control, chemical dosing and the like.
• PLC interlock systems and, if required, software to interface with the plant's master PLC.
• Skid mounted and/or containerised versions for remote or package installations.
• Standard version offers backwash only with rinse cycles added for potable or exacting duties.
• Proprietary design using stabilised media systems enables very high backwash rates to be used which in turn ensure the media is effectively washed every time. This design also ensures even filtration and rinse flow patterns.
• Automatic valve actuation either through pneumatic or electrical sequences.
• Control cabinet fitted with alarm and indicator lamps.
• Control cabinet to IP 65 for arduous duties.
• To ensure intrinsically safe installations, actuators use low voltage systems.
• Air scouring features fitted for critical applications.
• Standard capacities range from 2.5 to 175 m3/hr/vessel. Larger flowrates per vessel designed to client's requirements.

The Maxflo AC range of activated carbon filters includes most of the above features. In addition, the following are also available:

• Automatic steam or hot water strip systems to flush volatile elements from the activated carbon.
• Thermal or disinfection approaches to eliminate bacterial growths within the beds.
• Automatic temperature controlled flush sequences.
• Automatic pressure relief and steam safety systems.
• Automatic drain and flush sequences.
• Superheat injection systems for dry sterilization and elimination of the generation of inflammable off gases.
• Where required automatic safe cooling regimes.
• Thermally clad filters for hot applications.
• Temperature sensing systems for entire bed control
• THM stripping filters designed for purified water applications.
• Solvent extraction polishing filters available for large mineral processing installations/applications.
• Intrinsically safe oil/gas industry AC scrubbing filters supplied with inert/safe gas control systems for hazard concern zone envrionments.

Up-flow filtration offers the following advantages:

• Almost full utilisation of the entire filter bed depth to provide extremely high dirt holding capacities.
• In-depth filtration filtering from coarse to fine in a continuous media grading.
• Higher service filtration velocity.
• Filter cleaned with the raw feed water or liquor.
• Simple to operate.
• Low head loss across the filter.
• No filter aids.
• No filter cloths.
• No moving parts.
• Vigorous air scour and backwashing ensure no 'mud balling' of media.
• Well suited to inline or contact flocculation/filtration systems.
• Well able to handle the industrial loads often experienced in steel works, pulp & paper industries, heavy industrial loads and dense precipitates or flocs.
• Filtration of pregnant solutions in the process and mining industries.